<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            height: 300px;
            width: 300px;
            /* border-width边框粗细 一般情况下都用px */
            border-width: 5px;
            /* border-style边框样式 solid：实线边框 dashed:虚线边框 dotted:点线边框 */
            /* border-style: solid; */
            /* border-style:dashed; */
            border-style: dotted;
            /* background-color边框颜色 */
            border-color: pink;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>